static AudioChannelLayout GetChannelLayout(AudioFormatProperty property, int value)
{
int size;
AudioFormatPropertyNative.AudioFormatGetPropertyInfo(property, sizeof(AudioFormatProperty), ref value, out size);
AudioChannelLayout layout;
IntPtr ptr = Marshal.AllocHGlobal(size);
if (AudioFormatPropertyNative.AudioFormatGetProperty(property, sizeof(AudioFormatProperty), ref value, ref size, ptr) == 0)
{
layout = new AudioChannelLayout(ptr);
}
else
{
layout = null;
}
Marshal.FreeHGlobal(ptr);
return(layout);
}
public AudioQueueStatus SetOfflineRenderFormat(AudioStreamBasicDescription desc, AudioChannelLayout layout)
{
int size;
var h = layout == null ? IntPtr.Zero : AudioChannelLayout.ToBlock(layout, out size);
try {
return(AudioQueueSetOfflineRenderFormat(handle, ref desc, h));
} finally {
Marshal.FreeHGlobal(h);
}
}
public AudioPanningInfo(AudioChannelLayout outputChannelMap)
{
if (outputChannelMap == null)
throw new ArgumentNullException ("outputChannelMap");
this.OutputChannelMap = outputChannelMap;
Coordinates = new float[3];
}
public AudioBalanceFade(AudioChannelLayout channelLayout)
{
if (channelLayout == null)
throw new ArgumentNullException ("channelLayout");
this.ChannelLayout = channelLayout;
}
// The returned block must be released with FreeHGbloal
internal static IntPtr ToBlock(AudioChannelLayout layout, out int size)
{
if (layout == null)
throw new ArgumentNullException ("layout");
if (layout.Channels == null)
throw new ArgumentNullException ("layout.Channels");
size = 12 + layout.Channels.Length * 20;
IntPtr buffer = Marshal.AllocHGlobal (size);
int p;
Marshal.WriteInt32 (buffer, 0, (int) layout.AudioTag);
Marshal.WriteInt32 (buffer, 4, layout.Bitmap);
Marshal.WriteInt32 (buffer, 8, layout.Channels.Length);
p = 12;
foreach (var desc in layout.Channels){
Marshal.WriteInt32 (buffer, p, (int) desc.Label);
Marshal.WriteInt32 (buffer, p + 4, (int) desc.Flags);
WriteFloat (buffer, p + 8, desc.Coords [0]);
WriteFloat (buffer, p + 12, desc.Coords [1]);
WriteFloat (buffer, p + 16, desc.Coords [2]);
p += 20;
}
return buffer;
}
internal static AudioChannelLayout FromHandle(IntPtr h)
{
var layout = new AudioChannelLayout ();
layout.AudioTag = (AudioChannelLayoutTag) Marshal.ReadInt32 (h, 0);
layout.Bitmap = Marshal.ReadInt32 (h, 4);
layout.Channels = new AudioChannelDescription [Marshal.ReadInt32 (h, 8)];
int p = 12;
for (int i = 0; i < layout.Channels.Length; i++){
var desc = new AudioChannelDescription ();
desc.Label = (AudioChannelLabel) Marshal.ReadInt32 (h, p);
desc.Flags = (AudioChannelFlags) Marshal.ReadInt32 (h, p+4);
desc.Coords = new float [3];
desc.Coords [0] = ReadFloat (h, p+8);
desc.Coords [1] = ReadFloat (h, p+12);
desc.Coords [2] = ReadFloat (h, p+16);
layout.Channels [i] = desc;
p += 20;
}
return layout;
}
public static AudioChannelLayoutTag? GetTagForChannelLayout (AudioChannelLayout layout)
{
if (layout == null)
throw new ArgumentNullException ("layout");
int ptr_size;
var ptr = layout.ToBlock (out ptr_size);
int size = sizeof (AudioChannelLayoutTag);
int value;
var res = AudioFormatPropertyNative.AudioFormatGetProperty (AudioFormatProperty.TagForChannelLayout, ptr_size, ptr, ref size, out value);
Marshal.FreeHGlobal (ptr);
return res != 0 ? null : (AudioChannelLayoutTag?) value;
}
public unsafe static float[,] GetMatrixMixMap (AudioChannelLayout inputLayout, AudioChannelLayout outputLayout)
{
if (inputLayout == null)
throw new ArgumentNullException ("inputLayout");
if (outputLayout == null)
throw new ArgumentNullException ("outputLayout");
var channels_count_output = GetNumberOfChannels (outputLayout);
if (channels_count_output == null)
throw new ArgumentException ("outputLayout");
var channels_count_input = GetNumberOfChannels (inputLayout);
if (channels_count_input == null)
throw new ArgumentException ("inputLayout");
int ptr_size;
var input_ptr = inputLayout.ToBlock (out ptr_size);
var output_ptr = outputLayout.ToBlock (out ptr_size);
var array = new IntPtr[] { input_ptr, output_ptr };
ptr_size = sizeof (IntPtr) * array.Length;
float[,] value;
AudioFormatError res;
fixed (IntPtr* ptr = &array[0]) {
value = new float[channels_count_input.Value, channels_count_output.Value];
var size = sizeof (float) * channels_count_input.Value * channels_count_output.Value;
fixed (float* value_ptr = &value[0, 0]) {
res = AudioFormatPropertyNative.AudioFormatGetProperty (AudioFormatProperty.MatrixMixMap, ptr_size, ptr, ref size, value_ptr);
}
}
Marshal.FreeHGlobal (input_ptr);
Marshal.FreeHGlobal (output_ptr);
return res == 0 ? value : null;
}
public static AudioFormatError Validate (AudioChannelLayout layout)
{
if (layout == null)
throw new ArgumentNullException ("layout");
int ptr_size;
var ptr = layout.ToBlock (out ptr_size);
var res = AudioFormatPropertyNative.AudioFormatGetProperty (AudioFormatProperty.ValidateChannelLayout, ptr_size, ptr, IntPtr.Zero, IntPtr.Zero);
Marshal.FreeHGlobal (ptr);
return res;
}
static AudioChannelLayout GetChannelLayout (AudioFormatProperty property, int value)
{
int size;
AudioFormatPropertyNative.AudioFormatGetPropertyInfo (property, sizeof (AudioFormatProperty), ref value, out size);
AudioChannelLayout layout;
IntPtr ptr = Marshal.AllocHGlobal (size);
if (AudioFormatPropertyNative.AudioFormatGetProperty (property, sizeof (AudioFormatProperty), ref value, ref size, ptr) == 0)
layout = new AudioChannelLayout (ptr);
else
layout = null;
Marshal.FreeHGlobal (ptr);
return layout;
}
public unsafe static float[,] GetMatrixMixMap(AudioChannelLayout inputLayout, AudioChannelLayout outputLayout)
{
if (inputLayout == null)
{
throw new ArgumentNullException("inputLayout");
}
if (outputLayout == null)
{
throw new ArgumentNullException("outputLayout");
}
var channels_count_output = GetNumberOfChannels(outputLayout);
if (channels_count_output == null)
{
throw new ArgumentException("outputLayout");
}
var channels_count_input = GetNumberOfChannels(inputLayout);
if (channels_count_input == null)
{
throw new ArgumentException("inputLayout");
}
int ptr_size;
var input_ptr = inputLayout.ToBlock(out ptr_size);
var output_ptr = outputLayout.ToBlock(out ptr_size);
var array = new IntPtr[] { input_ptr, output_ptr };
ptr_size = sizeof(IntPtr) * array.Length;
float[,] value;
AudioFormatError res;
fixed(IntPtr *ptr = &array[0])
{
value = new float[channels_count_input.Value, channels_count_output.Value];
var size = sizeof(float) * channels_count_input.Value * channels_count_output.Value;
fixed(float *value_ptr = &value[0, 0])
{
res = AudioFormatPropertyNative.AudioFormatGetProperty(AudioFormatProperty.MatrixMixMap, ptr_size, ptr, ref size, value_ptr);
}
}
Marshal.FreeHGlobal(input_ptr);
Marshal.FreeHGlobal(output_ptr);
return(res == 0 ? value : null);
}